HighCVE-2026-28699

Gitea Basic Auth bypasses OAuth2 access token scopes (CVE-2026-28699)

Published 03.07.2026Last modified 25.10.2026Sources: CVE.org, OSV, BSI

Public exploit

What is affected, what to do

Gitea versions up to and including 1.26.1 allow OAuth2 access token scope enforcement to be bypassed through HTTP Basic authentication.

An exploit is publicly available. Update Gitea to version 1.26.2.

Affected: Gitea Open Source Git Server lte *..1.26.1

Not sure whether and how you are affected? Ask a question about this vulnerability

Metrics

8.1

Priority

XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

Source: NVD, CVSS v3

8.1

CVSS v3

Severity High on the scale from 0 to 10.

Source: CVE.org, OSV, BSI

0.5 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 45.9

Show all metrics

Severity: High
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: 77.45 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: PoC (publicly reported)
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: 8.1 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: 8.1
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: 0.5 %; 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: 45.9; High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
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: 03.07.2026
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-284, CWE-863

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

Gitea versions up to and including 1.26.1 allow OAuth2 access token scope enforcement to be bypassed through HTTP Basic authentication.

Source: NVD (NIST), cvelistv5, OSV (Open Source Vulnerabilities), BSI CSAF, BSI WID Portal

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

Affected products
		Affected versions	Fixed in
Gitea	Gitea Open Source Git Server	`≤ 1.26.1`	—
Open Source	Gitea	`< 1.26.2`	`1.26.2`
go	code.gitea.io/gitea	`—`	—

Vendors and products

Weakness classes (CWE)

CWE-284Improper Access Control
Pillar
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
Entry at MITRE CWE-284
CWE-863Incorrect Authorization
Class
The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
Entry at MITRE CWE-863

Public exploit references

Publicly reported proof-of-concepts, exploit modules and detection templates for this vulnerability. NEOSEC links to the original sources only and does not provide any exploit code.

Public exploit references

PoC-in-GitHub (nomi-sec)	gitea-CVE-2026-28699 (opens in a new tab)github.com	PoC (publicly reported)reported, not verified	11.06.2026

References & sources

github.comGitHub Security Advisoryadvisory, Vendor advisory
github.comGitHub Pull Request #37503Patch
github.comGitea v1.26.2 ReleaseRelease notes
blog.gitea.comGitea v1.26.2 Release Blog PostRelease notes
github.comgo-gitea/giteapackage

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).

06.07.2026Record modifiedCISA ADP

CISA assessment (SSVC): exploitation: proof of concept, automatable: no

New references:

https://github.com/go-gitea/gitea/security/advisories/GHSA-9r5x-wg6m-x2rc

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://github.com/go-gitea/gitea/security/advisories/GHSA-9r5x-wg6m-x2rc
SSVC assessment	added	—	{"id":"CVE-2026-28699","role":"CISA Coordinator","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-07-06T15:18:36.564092Z"}

Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

03.07.2026ReceivedGitea

CVSS V3.1: AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Weakness type: CWE-284, CWE-863

Description added or changed

New references:

Show 9 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Gitea Open Source Git Server
Description	added	—	Gitea versions up to and including 1.26.1 allow OAuth2 access token scope enforcement to be bypassed through HTTP Basic authentication.
CVSS	added	—	AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness type (CWE)	added	—	CWE-284
Weakness type (CWE)	added	—	CWE-863
Reference	added	—	https://blog.gitea.com/release-of-1.26.2/
Reference	added	—	https://github.com/go-gitea/gitea/pull/37503
Reference	added	—	https://github.com/go-gitea/gitea/releases/tag/v1.26.2
Reference	added	—	https://github.com/go-gitea/gitea/security/advisories/GHSA-9r5x-wg6m-x2rc

Source identifier: 88ee5874-cf24-4952-aea0-31affedb7ff2

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