CVE-2021-24838Public exploitNetwork attack vector

User redirection via unvalidated REST parameter

Published Jan 17, 2022 · Updated Aug 3, 2024

Open redirect in AnyComment before 0.3.5 allows remote attackers to send users to an arbitrary site through a crafted REST API URL. The unauthenticated /wp-json/anycomment/v1/auth/wordpress endpoint passes the redirect parameter directly to wp_redirect() without validating its destination. A victim must follow an attacker-crafted link; the resulting trusted-site redirect sends the victim to an attacker-selected destination.

CVSS severity5.4
Medium
EPSS probability2.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Open redirect in AnyComment before 0.3.5 allows remote attackers to send users to an arbitrary site through a crafted REST API URL. The unauthenticated /wp-json/anycomment/v1/auth/wordpress endpoint passes the redirect parameter directly to wp_redirect() without validating its destination. A victim must follow an attacker-crafted link; the resulting trusted-site redirect sends the victim to an attacker-selected destination.

The record

CVE
CVE-2021-24838
Published
Jan 17, 2022
Updated
Aug 3, 2024
Vendor
Alexander
Product
AnyComment
Classifications
CWE-601
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 17, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0.3.5 <0.3.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Alexander · AnyCommentversion=0.3.5 <0.3.5

Published CVSS scores

5.4WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

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-601URL Redirection to Untrusted Site ('Open Redirect')

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo