What is CVE-2022-0877?

CVE-2022-0877 is a medium-severity vulnerability in Bookstackapp Bookstack, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2022-03-08.

How severe is CVE-2022-0877?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Is CVE-2022-0877 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Bookstackapp Bookstack

CVE-2022-0877

Cross-site Scripting (XSS) - Stored in GitHub repository bookstackapp/bookstack prior to v22.02.3.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-03-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (54.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Bookstackapp Bookstack
Bookstackapp Bookstackapp/bookstack — versions unspecified

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

huntr.dev/bounties/b04df4e3-ae5a-4dc6-81ec-496248b15f3c (Exploit, Patch, Third Party Advisory, Issue Tracking)
github.com/bookstackapp/bookstack/commit/856fca8289b7370cafa033ea21c408e7d4303f… (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2022-0877?: CVE-2022-0877 is a medium-severity vulnerability in Bookstackapp Bookstack, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2022-03-08.
How severe is CVE-2022-0877?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2022-0877 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.