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Medium

Cross-site Scripting in apostrophe

  • Disclosed: 10.11.2021
  • Updated: 11.10.2026 10:22

Apostrophe CMS versions between 2.63.0 to 3.3.1 are vulnerable to Stored XSS where an editor uploads an SVG file that contains malicious JavaScript onto the Images module, which triggers XSS once viewed.

Affected software

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PlatformPackageVulnerable versionsFixed in
npm package apostrophe >= 2.63.0, < 3.4.0 3.4.0

References

CVSS score 5.4/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE)
CWE-79
Platform
npm
Package
apostrophe
Disclosed
10.11.2021
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-4r9c-jghc-cx5m - CC BY 4.0

Vulnerability history: apostrophe

All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (27) in the archive
Total entries
27
First → latest
09.2020 10.2026
Without a fix
4
Exploited in attacks
0

Severity breakdown

  • Critical 2
  • High 8
  • Medium 13
  • Low 4

Disclosures per year

Severity:
  1. ApostropheCMS: Unauthenticated CSV import requests leave rejected uploads in the system temporary directory
    High · 7.5 CVE-2026-113658 < 4.33.0 4.33.0
  2. ApostropheCMS: Authenticated projection-exclusion prototype-member deletion in @apostrophecms/db-connect causes process-wide denial of service
    High · 7.1 CVE-2026-113666 < 4.33.0 4.33.0
  3. ApostropheCMS: 2nd-order prototype pollution via PATCH leading to single-request persistent DoS
    High CVE-2026-71553 <= 4.32.0 no fix
  4. Apostrophe has Server-Side Prototype Pollution in apos.util.set via patch operators that leads to process-wide authorization bypass
    Critical · 9.1 CVE-2026-53609 < 4.31.0 4.31.0
  5. Apostrophe has stored XSS via javascript: URL in Image Widget Link
    High · 7.3 CVE-2026-45011 = 4.29.0 no fix
  6. Apostrophe has a Weak Password Recovery Mechanism for Forgotten Password and Improper Input Validation
    High · 8.1 CVE-2026-45013 <= 4.29.0 no fix
  7. Apostrophe has authenticated SSRF in rich-text widget import via @apostrophecms/area/validate-widget
    High · 7.6 CVE-2026-45012 <= 4.29.0 no fix
  8. Stored XSS in SEO Fields Leads to Authenticated API Data Exposure in ApostropheCMS
    High · 8.7 CVE-2026-35569 < 4.29.0 4.29.0
  9. ApostropheCMS MFA/TOTP Bypass via Incorrect MongoDB Query in Bearer Token Middleware
    High · 8.1 CVE-2026-32730 < 4.28.0 4.28.0
  10. Apostrophe CMS Insufficient Session Expiration vulnerability
    Critical · 9.8 CVE-2021-25979 >= 2.63.0, < 3.4.0 3.4.0
  11. Cross-site Scripting in apostrophe this entry
    Medium · 5.4 CVE-2021-25978 >= 2.63.0, < 3.4.0 3.4.0

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