5.3

CVE-2021-26539: apostrophecms sanitize-html

CVSS: 5.3v3.1MediumModified
AliasesGHSA-rjqq-98f6-6j3r
Published 08-02-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-26539 is a medium (CVSS 5.3) vulnerability in apostrophecms sanitize-html. EPSS estimates a 1.95% chance of exploitation in the next 30 days, higher than 80% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
32/100
0100
Medium · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (NVD)
EPSS score
1.95%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 08-02-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

Apostrophe Technologies sanitize-html before 2.3.1 does not properly handle internationalized domain name (IDN) which could allow an attacker to bypass hostname whitelist validation set by the "allowedIframeHostnames" option.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.95%

Chance of exploitation in the next 30 days

Percentile

80%

Versus all other CVEs

30-day change

0.00 pp

From 1.95% on 21-09-2026

21-09-202621-10-2026
EPSS score
1.95%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (advisory.checkmarx.net)

    Maturity: unknown

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Apostrophecms1 product
Npm1 product
  • sanitize-html< 2.3.1

2 vendors · 2 products

References

6 links