What is CVE-2026-46556?

CVE-2026-46556 is a medium-severity vulnerability in Flaskbb, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.5/10. Published 2026-07-21.

How severe is CVE-2026-46556?

Medium severity. CVSS v3 base score is 6.5 out of 10.

SSRF in Flaskbb

CVE-2026-46556

FlaskBB is a Forum Software written in Python using the micro framework Flask. Prior to version 2.2.1, a Server-Side Request Forgery (SSRF) vulnerability in get_image_info() allows any authenticated user to force the server to send HTTP requests to arbitrary internal endpoints, including cloud metadata services. This is a blind SSRF with confirmed internal port scanning and internal API triggering capabilities. Version 2.2.1 patches the issue.

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.004 (28.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Flaskbb — versions < 2.2.1

Weakness classification (CWE)

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

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-46556?: CVE-2026-46556 is a medium-severity vulnerability in Flaskbb, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.5/10. Published 2026-07-21.
How severe is CVE-2026-46556?: Medium severity. CVSS v3 base score is 6.5 out of 10.