What’s Vulnerable › Vulnerabilities

CVE-2021-3758: Server-Side Request Forgery (SSRF) in bookstackapp/bookstack

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-09-02 · updated 2026-06-17
• Weakness: CWE-918

Description

bookstack is vulnerable to Server-Side Request Forgery (SSRF)

Affected products

• bookstackapp/bookstack: before 21.08 — fixed in 21.08

How to fix

Upgrade to a fixed version: bookstackapp/bookstack 21.08. Check the vendor advisory for mitigations.

References

• https://github.com/bookstackapp/bookstack/commit/bee5e2c7ca637d034c6985c0328cef0ce068778e
• https://huntr.dev/bounties/a8d7fb24-9a69-42f3-990a-2db93b53f76b
• https://github.com/bookstackapp/bookstack/commit/bee5e2c7ca637d034c6985c0328cef0ce068778e
• https://huntr.dev/bounties/a8d7fb24-9a69-42f3-990a-2db93b53f76b

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