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CVE-2026-129170FileCodeBox 2.2.1 through 2.8.4 Stored XSS via Markdown Preview Parser Error
- 5.3MediumCVSS base score
- 0.27%Exploitation in 30 daysEPSS · top 80% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
FileCodeBox 2.2.1 through 2.8.4 contains a stored cross-site scripting vulnerability in renderMarkdownPreview, which returns unsanitized text when the marked parser throws. Unauthenticated attackers can share text with thousands of nested blockquote markers followed by HTML payloads, executing script that steals the admin token from localStorage.
Timeline
ID reserved
By VulnCheck
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| VulnCheckCNA (assigner) | 4.0 | Medium5.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N |
| VulnCheckCNA (assigner) | 3.1 | Medium6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVDNVD · Deferred | 4.0 | Medium5.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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 |
- EPSS (exploitation in 30 days)
- 0.27% · top 80% of all CVEs (14 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Affected products
- affected 2.2.1 – ≤ 2.8.4
References
References6
- https://vul.yulun.ac.cn/20261027/filecodebox/ (opens in a new tab)third-party-advisory
- https://github.com/vastsa/FileCodeBox/issues/557 (opens in a new tab)issue-tracking
- https://github.com/vastsa/FileCodeBoxFronted/commit/4c40406d366af1583a3ba2327366b7a62d765537 (opens in a new tab)patch
- https://github.com/vastsa/FileCodeBoxFronted/blob/bcc1dbda06b772d6f4afbcc12c6f12e60bbbc7da/src/utils/content-preview.ts#L43-L57 (opens in a new tab)technical-description
- https://github.com/vastsa/FileCodeBoxFronted/blob/bcc1dbda06b772d6f4afbcc12c6f12e60bbbc7da/src/components/common/ContentPreviewModal.vue#L45-L50 (opens in a new tab)technical-description
- VulnCheck Advisory: FileCodeBox 2.2.1 through 2.8.4 Stored XSS via Markdown Preview Parser Error (opens in a new tab)third-party-advisory
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-125597 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-129170)Record last updated .