CVE-2021-25978
CVE-2021-25978 is a medium-severity vulnerability in Apostrophecms with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.
Key facts
- Severity: Medium (CVSS 3.x base score 5.4)
- CVSS v2: 3.5
- EPSS exploit prediction: 0% (38th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-79
- Affected product: Apostrophecms
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2021-25978?
- 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.
- How severe is CVE-2021-25978?
- CVE-2021-25978 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2021-25978 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-25978?
- CVE-2021-25978 affects Apostrophecms. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-25978?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2021-25978 published?
- CVE-2021-25978 was published on 2021-11-07 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:apostrophecms:apostrophecms:*:*:*:*:*:*:*:*
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