What is CVE-2021-27693?

CVE-2021-27693 is a critical-severity vulnerability in Publiccms, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.8/10. Published 2022-09-02.

How severe is CVE-2021-27693?

Critical severity. CVSS v3 base score is 9.8 out of 10.

SSRF in Publiccms

CVE-2021-27693

Server-side Request Forgery (SSRF) vulnerability in PublicCMS before 4.0.202011.b via /publiccms/admin/ueditor when the action is catchimage.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2022-09-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.011 (63.4th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.011 · change: +0.000

Affected products

Publiccms

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

github.com/sanluan/PublicCMS/issues/51 (Exploit, Third Party Advisory, Issue Tracking)
github.com/sanluan/PublicCMS/commit/0f4c4872914b6a71305e121a7d9a19c07cde0338 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-27693?: CVE-2021-27693 is a critical-severity vulnerability in Publiccms, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.8/10. Published 2022-09-02.
How severe is CVE-2021-27693?: Critical severity. CVSS v3 base score is 9.8 out of 10.