CVE-2026-26276 is a high-severity (CVSS 7.3) Cross-site Scripting (XSS) vulnerability in gogs.io/gogs. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.
Gogs: DOM-based XSS via milestone selection
Exploitation Status
No confirmed exploitation observed yet
- A successful exploit gives an attacker total control of the affected component, not partial access.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-26276.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
gogs.io/gogsReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
Summary
It was confirmed in a test environment that an attacker can store an HTML/JavaScript payload in a repository’s Milestone name, and when another user selects that Milestone on the New Issue page (/issues/new), a DOM-Based XSS is triggered.
Impact
- Theft of information accessible in the victim’s session.
- Extraction of CSRF tokens and submission of state-changing requests with the victim’s privileges.
- Repository operations performed with the victim’s privileges (Issue operations, settings changes, etc.).
(The impact scope depends on the victim’s permission level.)
Remediation
A fix is available at https://github.com/gogs/gogs/releases/tag/v0.14.2
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | gogs.io/gogs | all versions | No fix |
Affected Products
gogsgogsDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for gogs.io/gogs, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
The records we use list no patched version of gogs.io/gogs for CVE-2026-26276. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.
Mitigate without a patch
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.
Frequently Asked Questions
Is CVE-2026-26276 in your dependencies?
Find it across Go, including transitive dependencies.