CVE-2022-25849Public exploitNetwork attack vector

Cross-site scripting via unfiltered Markdown link href

Published Oct 26, 2022 · Updated May 9, 2025

Cross-site scripting in SegmentFault HyperDown 2.4.27 and earlier allows remote attackers to execute script via crafted Markdown. The Markdown link parser accepts an entity-encoded JavaScript scheme in the href attribute and emits it into an HTML anchor without effective filtering. Execution requires an application to render attacker-controlled Markdown and a user to click the generated link, enabling browser-context data access or actions.

CVSS severity5.4
Medium
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in SegmentFault HyperDown 2.4.27 and earlier allows remote attackers to execute script via crafted Markdown. The Markdown link parser accepts an entity-encoded JavaScript scheme in the href attribute and emits it into an HTML anchor without effective filtering. Execution requires an application to render attacker-controlled Markdown and a user to click the generated link, enabling browser-context data access or actions.

The record

CVE
CVE-2022-25849
Published
Oct 26, 2022
Updated
May 9, 2025
Vendor
SegmentFault
Product
HyperDown
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 26, 2022CVE publishedPublication date reported by the CVE source.
  2. May 9, 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=0.0.0 <unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SegmentFault · HyperDownversion=0.0.0 <unspecified

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.4SnykCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

Public exploit references

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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