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Fencer Intel
low 3.1

CVE-2020-5283 json

XSS vulnerability in CVS show_subdir_lastmod support

published 6y ago modified 4mo ago also EUVD-2020-26479

cvss
3.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

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.

Patch / fix

  • viewvc viewvc 1.1.28, 1.2.1
  • viewvc openSUSE Tumbleweed 1.3.0~dev20230104-1.1
  • viewvc Package Hub 15 SP2 1.1.28-bp152.4.3.1
  • viewvc openSUSE Leap 15.2 1.1.28-lp152.4.3.1
  • viewvc Package Hub 15 SP1 1.1.28-bp151.4.3.1
  • viewvc openSUSE Leap 15.1 1.1.28-lp151.3.3.1

opensuse advisories openSUSE-SU-2024:12857-1openSUSE-SU-2021:0145-1openSUSE-SU-2021:0123-1openSUSE-SU-2021:0119-1openSUSE-SU-2021:0084-1

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-5283 updated cvss 3.1

viewvc: XSS vulnerability in CVS show_subdir_lastmod support

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.36% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/viewvc/viewvc/issues/211 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 3.1 CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:N
NVD 3.1 3.5 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N
NVD 2.0 2.1 AV:N/AC:H/Au:S/C:N/I:P/A:N

Affected products

  • viewvc viewvc

Classification

Weakness
  • CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Intel 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.