CVE-2021-42551 json
Reflected XSS in NetBiblio WebOPAC search functionality
published 2022-01-14 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-29519
- cvss
- 6.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.7%
- EPSS 2.7% chance of exploitation in 30 days, percentile 86%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
Cross-site Scripting (XSS) vulnerability in the search functionality of AlCoda NetBiblio WebOPAC allows an unauthenticated user to craft a reflected Cross-Site Scripting attack. This issue affects: AlCoda NetBiblio WebOPAC versions prior to 4.0.0.320; versions later than 4.0.0.328. This issue does not affect: AlCoda NetBiblio WebOPAC version 4.0.0.335 and later versions.
Patch / fix
- AlCoda NetBiblio WebOPAC 4.0.0.320
Exploit prediction
2.71% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Nuclei template NetBiblio WebOPAC - Cross-Site Scripting nuclei detection template
- redguard.ch https://www.redguard.ch/advisories/netbiblio_webopac.txt referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Affected products
- AlCoda NetBiblio WebOPAC
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
redguard.ch
/advisories/netbiblio_webopac.txt
exploit, third-party-advisory
Sources
- CVE List CVE-2021-42551
- NVD CVE-2021-42551
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.