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No exploitation reportedFix available

CVE-2020-11888

No exploitation reported by the sources we read.

  • Published2020-04-20
  • Fixed in2.3.9
  • WeaknessCWE-79

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

python-markdown2 through 2.3.8 allows XSS because element names are mishandled unless a \w+ match succeeds. For example, an attack might use elementname@ or elementname- with an onclick attribute.

Timeline

dates in UTC
  1. 2020-04-2016:15CVE publishedNVD

Versions per branch

OSV · NVD
markdown2
BranchAffectedFixed in
2.3< 2.3.92.3.9
Python-markdown2 project python-markdown2
BranchAffectedFixed in
2.3≤ 2.3.8no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • python-markdown2Ubuntu:20.04:LTSall versions · no fixed version listed
  • python-markdown2SUSE:Package Hub 15 SP1all versions · fixed in 2.3.7-bp151.2.3.1
  • python-markdown2openSUSE:Leap 15.1all versions · fixed in 2.3.7-lp151.2.3.1
  • python-markdown2Debian:14all versions · fixed in 2.3.9-1
  • python-markdown2Debian:13all versions · fixed in 2.3.9-1
  • python-markdown2Debian:12all versions · fixed in 2.3.9-1

Vendor advisories

  • CVE-2020-11888 Red Hat Product Security

    python-markdown2: Unsanitized input allows for cross-site scripting (XSS)

Full record on NVD

Fix

  1. Update markdown2 to 2.3.9

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.16.1read 2026-10-23
  • NVDCVSS 2.04.3read 2026-10-23
  • NVDweakness (CWE)CWE-79read 2026-10-23
  • FIRST EPSSEPSS score1.9 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryMODERATE2020-04-22

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Published
2020-04-20
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-fv3h-8x5j-pvgq

Frequently asked questions

What is CVE-2020-11888?

python-markdown2 through 2.3.8 allows XSS because element names are mishandled unless a \w+ match succeeds. For example, an attack might use elementname@ or elementname- with an onclick attribute.

Is CVE-2020-11888 actively exploited?

Active exploitation of CVE-2020-11888 has not been confirmed. Its EPSS score was 1.9% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-11888?

CVE-2020-11888 has a CVSS v3 base score of 6.1 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

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