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CVE-2026-46556— FlaskBB: SSRF in get_image_info() via unrestricted avatar URL

Quick assessment

Affected

flaskbb flaskbb

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FlaskBB FlaskBB是FlaskBB组织开源的一个使用 Flask 框架用 Python 编写的经典论坛软件。 FlaskBB 2.2.1之前版本存在服务端请求伪造漏洞，该漏洞源于get_image_info()函数存在服务器端请求伪造（SSRF）问题，可能导致任何经过身份验证的用户强制服务器将HTTP请求发送到任意内部端点，包括云元数据服务。

CVSS 6.5 · Medium EPSS 0.35% · P29 Updated Jul 22, 2026

Possible ATT&CK Techniques 2 AI

T1590 · Gather Victim Network Information T1113 · Screen Capture

Affected Version Matrix 1

Vendor	Product	Version Range	Status
flaskbb	flaskbb	`< 2.2.1`	affected

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I. Basic Information for CVE-2026-46556

Vulnerability Information

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Vulnerability Title

FlaskBB: SSRF in get_image_info() via unrestricted avatar URL

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

服务端请求伪造(SSRF)

Source: CVE Program / CVE List V5

Vulnerability Title

FlaskBB 服务端请求伪造漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
flaskbb	flaskbb	< 2.2.1	-

II. Public POCs for CVE-2026-46556

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-46556

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Patches & Fixes for CVE-2026-46556 (1)

🔗 Do not allow redirects when fetching the avatar information · flaskbb/flaskbb@e87e585 · GitHub x_refsource_MISC

Vendor Advisories for CVE-2026-46556 (1)

🔗 SSRF in get_image_info() via unrestricted avatar URL (CWE-918) · Advisory · flaskbb/flaskbb · GitHub Read full article x_refsource_CONFIRM

https://www.cve.org/CVERecord?id=CVE-2026-46556

IV. Related Vulnerabilities

Same product: flaskbb

Same vendor: flaskbb

Same weakness: CWE-918