CVE-2021-25978

MEDIUM
Published Nov 7, 20214y ago · Modified Jun 17, 20262w ago
5.4 CVSS 3.1
Medium
Find Similar
Published Nov 7, 2021 4y ago
Last Modified Jun 17, 2026 2w ago

Description

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.

CVSS Details

Base Score
5.4
Exploitability
2.3
Impact
2.7
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction Required
Scope Changed
Confidentiality Low
Integrity Low
Availability None

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

Affected Products 1

VendorProductVersionRange
apostrophecmsapostrophecms*≥2.63.0  –  ≤3.3.1

References 1

  • github.com https://github.com/apostrophecms/apostrophe/commit/c8b94ee9c79468f1ce28e31966cb0e0839165e59
    PatchThird Party Advisory

Remediation

  • github.com https://github.com/apostrophecms/apostrophe/commit/c8b94ee9c79468f1ce28e31966cb0e0839165e59
    PatchThird Party Advisory