CVE-2021-25989Network attack vector

Stored XSS via unsanitized markdown input

Published Dec 29, 2021 · Updated Apr 30, 2025

Stored XSS in the ifme markdown editor through 7.31.4 allows remote authenticated users to execute script in a group leader's browser. InputTextarea stored initial, edited, and pasted HTML without sanitization, and group rendering later inserted the saved markup into a leader's page. An attacker needs an account and must make the victim a group Leader; viewing the group then triggers script with the victim's session context.

CVSS severity5.4
Medium
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in the ifme markdown editor through 7.31.4 allows remote authenticated users to execute script in a group leader's browser. InputTextarea stored initial, edited, and pasted HTML without sanitization, and group rendering later inserted the saved markup into a leader's page. An attacker needs an account and must make the victim a group Leader; viewing the group then triggers script with the victim's session context.

The record

CVE
CVE-2021-25989
Published
Dec 29, 2021
Updated
Apr 30, 2025
Vendor
if-me
Product
ifme
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 29, 2021CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0 <unspecified
  2. Affected versionversion=unspecified <=v7.31.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

if-me · ifmeversion=1.0.0 <unspecified; version=unspecified <=v7.31.4

Published CVSS scores

5.4MendCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NVDAV:N/AC:M/Au:S/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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