Forged signed tokens let any registered user take over other users and organizations (CVE-2026-115933)
Published Last modified Sources: pwn.watch, CVE.org
What is affected, what to do
Postiz signs its session, invitation and password reset tokens with one shared secret and without any marker of what a token is for. A route that refreshes the credentials of a browser-extension channel signed data taken from the request itself and stored the result where the requesting user can read it back.
Update GitroomHQ Postiz-app to version 2.25.3.
- Affected
- GitroomHQ Postiz-app
lt 2.15.0..2.25.3
- GitroomHQ Postiz-app
- Fixed in
- GitroomHQ Postiz-app
2.25.3
- GitroomHQ Postiz-app
Not sure whether and how you are affected? Ask a question about this vulnerability
Metrics
9.9
Priority
XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.
Source: Vendor (CNA), CVSS v3
9.9
CVSS v3
Severity Critical on the scale from 0 to 10.
Source: pwn.watch, CVE.org
0.3 %
EPSS score
Low — model estimates < 1% exploitation likelihood.
Source: FIRST EPSS, percentile 16.2
Show all metrics
- Severity
- Critical
Priority (0–325)
The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?
Read in glossary- 81.59 Methodology
Exploit maturity
An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.
Read in glossary- no public PoC known
XIEM Effective CVSS
XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.
Read in glossary- 9.9 Methodology
CVSS v3
CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.
Read in glossary- 9.9
EPSS score
The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.
Read in glossary- 0.3 %
- Low — model estimates < 1% exploitation likelihood.
EPSS percentile
The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.
Read in glossary- 16.2
- Elevated — this CVE ranks above at least 10% of all CVEs scored today.
KEV status
The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.
Read in glossary- —
- Published
CWE
CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.
Read in glossary- CWE-290, CWE-345, CWE-915
Detection rules
No NEOSEC detection rule is available for this vulnerability yet.
Classification under NIS2 and CRA
Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.
NIS2
NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.
Read in glossary- High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
CRA
The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.
Read in glossary- From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001
ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.
Read in glossary- Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.
Description
Postiz signs its session, invitation and password reset tokens with one shared secret and without any marker of what a token is for. A route that refreshes the credentials of a browser-extension channel signed data taken from the request itself and stored the result where the requesting user can read it back. A user could therefore obtain a validly signed token containing any claims they choose, which the application accepts as a session, as an organization invitation with a chosen role, as a password reset or as an enterprise provisioning token. A second, narrower route that creates team invitations signs extra fields from the request body in the same way.
Source: pwn.watch, NVD (NIST), CVE.org (MITRE), cvelistv5
Affected products
The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.
| Affected versions | Fixed in | ||
|---|---|---|---|
| GitroomHQ | postiz-app |
|
|
Vendors and products
Weakness classes (CWE)
CWE-290Authentication Bypass by Spoofing
Base
This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.
Entry at MITRE CWE-290CWE-345Insufficient Verification of Data Authenticity
Class
The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.
Entry at MITRE CWE-345CWE-915Improperly Controlled Modification of Dynamically-Determined Object Attributes
Base
The product receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified.
Entry at MITRE CWE-915
References & sources
- pwn.watchpwn.watch: Postiz: forged signed tokens and post-media path traversal let any registered user take over orgs and read server files (CVE-2026-115933, CVE-2026-115932)pwn-watch
- gadvisory.orgPSA-2026-YT2HMH: Forged signed tokens let any registered user take over other users and organizationspwn-watch, Vendor advisory
- gadvisory.orgPSA-2026-E9AHFV: Path traversal in post media lets any registered user read server filespwn-watch
- CVE.org (MITRE)CVE-2026-115933pwn-watch
- CVE.org (MITRE)CVE-2026-115932pwn-watch
- github.comPostiz v2.25.3 releasepwn-watch, Release notes
- github.comPostizProduct
- github.coma5affe62Patch
Changes to this CVE
Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).
Received4cdc9741…
CVSS V3.1: AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness type: CWE-345, CWE-290, CWE-915
Description added or changed
Show 10 original changes
Individual changes of this event as published by NVD Type Action Before After Description added —Postiz signs its session, invitation and password reset tokens with one shared secret and without any marker of what a token is for. A route that refreshes the credentials of a browser-extension channel signed data taken from the request itself and stored the result where the requesting user can read it back. A user could therefore obtain a validly signed token containing any claims they choose, which the application accepts as a session, as an organization invitation with a chosen role, as a password reset or as an enterprise provisioning token. A second, narrower route that creates team invitations signs extra fields from the request body in the same way.CVSS added —AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HWeakness type (CWE) added —CWE-345Weakness type (CWE) added —CWE-290Weakness type (CWE) added —CWE-915Affected versions (publisher) added —New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/115xxx/CVE-2026-115933.json">CVE-2026-115933</a>Reference added —https://gadvisory.org/advisories/PSA-2026-YT2HMHReference added —https://github.com/gitroomhq/postiz-appReference added —https://github.com/gitroomhq/postiz-app/commit/a5affe62c74e39c1e7ac960d50d8418b807d532cReference added —https://github.com/gitroomhq/postiz-app/releases/tag/v2.25.3Source identifier: 4cdc9741-f887-419a-a2fd-acbbd2729276
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<a href="https://intel.neosec.eu/en/cve/CVE-2026-115933"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-115933.svg?lang=en" alt="CVE-2026-115933 – NEOSEC Intel" height="20"></a>