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TI-2020-04339 Aliases CVE-2020-5283

XSS vulnerability in CVS show_subdir_lastmod support

Priority LOW 20CWE-80Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-80.

Summary

ViewVC before versions 1.1.28 and 1.2.1 has a XSS vulnerability in CVS show_subdir_lastmod support. The impact of this vulnerability is mitigated by the need for an attacker to have commit privileges to a CVS repository exposed by an otherwise trusted ViewVC instance that also has the `show_subdir_lastmod` feature enabled. The attack vector involves files with unsafe names (names that, when embedded into an HTML stream, would cause the browser to run unwanted code), which themselves can be challenging to create. This vulnerability is patched in versions 1.2.1 and 1.1.28.

Why it matters now

EPSS 0.01363 71st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed viewvc (viewvc): 1.1.28, 1.2.1

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
viewvcviewvcbefore 1.1.28; 1.2.0 to before 1.2.11.1.28, 1.2.1Patch availableCNA
  • viewvc Vendorviewvc Affected before 1.1.28; 1.2.0 to before 1.2.1 Fixed in 1.1.28, 1.2.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:viewvc:viewvc:*:*:*:*:*:*:*:*before 1.1.28; 1.2.0 to before 1.2.1Vulnerableviewvc
  • cpe:2.3:a:viewvc:viewvc:*:*:*:*:*:*:*:* Versions before 1.1.28; 1.2.0 to before 1.2.1 Vulnerable ·viewvc

Remediation

  • Fix · CNA viewvc (viewvc) Fixed in 1.1.28, 1.2.1

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-5283

References

Exploit 1

Patch 2

Advisory 1

  • TI-2025-33984 ViewVC's standalone server exposes arbitrary server filesystem content CVSS 3.1HIGH 7.5
  • TI-2023-08713 ViewVC XSS vulnerability in revision view changed path "copyfrom" locations CVSS 3.1MEDIUM 5.4
  • TI-2010-00005 query.py in the query interface in ViewVC before 1.1.3 does not reject configurations… CVSS 2.0HIGH 7.5
  • TI-2007-05516 viewvc 1.0.3 allows improper access control to files in a repository when using the "forbidden" configuration option. CVSS 3.1HIGH 7.5
  • TI-2006-05254 ViewVC 1.0.2 and earlier does not specify a charset in its HTTP headers or HTML… CVSS 2.0MEDIUM 6.8
  • TI-2017-03857 Cross-site scripting (XSS) vulnerability in the nav_path function in lib/viewvc.py in… CVSS 3.0MEDIUM 6.1
See all 20 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences