CVE-2026-126569 json
Mbin 1.2.1 before 1.11.1 Stored XSS via Markdown Image Nested in Link
published yesterday modified yesterday also EUVD-2026-123083 , GHSA-g3r9-j6w4-2257
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository MbinOrg/mbin. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 5.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 13%
- public exploits
- 0
- none known
Summary
Mbin 1.2.1 before 1.11.1 contains a stored cross-site scripting vulnerability in EmbedElement::buildDestructed() that renders nested Markdown image alt text and URL without HTML escaping. Authenticated users can embed HTML in the alt text of an image inside a link in entries, comments, posts, messages, or bios to run script in viewers' browsers.
Patch / fix
- MbinOrg mbin 1.11.1
Is CVE-2026-126569 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
0.22% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 5.1 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N |
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| CNA | 4.0 | 5.1 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
Affected products
- MbinOrg mbin
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/MbinOrg/mbin/commit/736fd39fe9cd59f5d51636d25e1857d88ddbd0bd
patch
-
github.com
/MbinOrg/mbin/security/advisories/GHSA-g3r9-j6w4-2257
vendor-advisory, advisory
-
github.com
/MbinOrg/mbin/releases/tag/v1.11.1
release-notes
-
github.com
/MbinOrg/mbin/blob/v1.11.0/src/Markdown/CommonMark/EmbedElement.php#L57-L67
technical-description
-
vulncheck.com
/advisories/mbin-1.2.1-before-1.11.1-stored-xss-via-markdown-image-nested-in-link
third-party-advisory
Sources
- CVE List CVE-2026-126569
- NVD CVE-2026-126569
- Maintainer advisory GHSA-g3r9-j6w4-2257
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of MbinOrg/mbin published their own advisory on GitHub. Reviewed sources take precedence over it.