🛡️ CVE-2018-18921 — phpservermon

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity high, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

• Attack vector: Network — reachable from anywhere that can route to the service.
• Attack complexity: Low — the attack works reliably, with no preparation.
• Privileges required: None — an unauthenticated stranger can try it.
• User interaction: Required — someone has to click, open or visit something.
• Scope: Unchanged — the damage stays inside the vulnerable component.
• Confidentiality impact: None.
• Integrity impact: High — total loss, or loss the attacker controls.
• Availability impact: None.

Weakness class

CVE-2018-18921 is classified as CWE-352: Cross-Site Request Forgery (CSRF). A state-changing request is accepted without proof it was intended, so another site can trigger it using the victim's session.

Affected software

CVE-2018-18921 is recorded against 1 package.

• phpservermon/phpservermon (fixed in 3.3.2)

Timeline and source

Published on 14 May 2022 and last revised on 16 February 2024. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
medium.com (Web)

Other advisories for this package

phpservermon/phpservermon has other advisories on record. If you are patching this one, these are worth checking on the same host:

• CVE-2024-5312 (published 24 May 2024)
• CVE-2021-4241 (published 16 Nov 2022)
• CVE-2021-4240 (published 16 Nov 2022)
• CVE-2021-4097 (published 16 Dec 2021)

Same weakness in other software

These advisories are the same class of weakness (CWE-352: Cross-Site Request Forgery (CSRF)) in other software:

• CVE-2023-37465 (published 27 Jul 2026)
• CVE-2023-6022 (8.0 High, published 7 Jul 2026)
• CVE-2022-43719 (8.0 High, published 7 Jul 2026)
• CVE-2016-4808 (published 6 Jul 2026)
• CVE-2011-4952 (8.0 High, published 2 Jul 2026)
• CVE-2021-4164 (8.0 High, published 2 Jul 2026)
• CVE-2022-47150 (4.3 Medium, published 11 Jun 2026)
• CVE-2022-44630 (4.6 Medium, published 11 Jun 2026)

Details

Affected Packages

References