Next.js: 59k servers compromised in 48h · I breached the attackers' C2 and here's what I found
Source Reddit NetSec
Mentioned vulnerabilities
Not known to be exploited · public exploit available (Metasploit, Exploit-DB) · 99% EPSS.
Data as of 26 Oct 2026, 07:57 UTC
Likely to be exploited
99.2% EPSS · Medium severity · No CVSS score from NVD or the CNA
- EPSS
- 99.2% chance of exploitation in 30 days – higher than 99% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
Public on cve.org; its publication date is not in this record
Detectable: evidence found.
Weaponised: evidence found.
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.
What to do
AI-suggested
The source advises immediate patching of vulnerable Next.js systems and rotation of all potentially compromised credentials. However, no specific patch or vendor advisory is provided in the data. Organizations should prioritize credential rotation and investigate for signs of backdoors or unauthorized access.
Description
Operation PCPcat is a large-scale credential theft campaign that compromised approximately 59,000 Next.js servers within 48 hours by exploiting two remote code execution vulnerabilities (CVE-2025-29927 and CVE-2025-66478). Attackers extracted sensitive files such as . env files, SSH keys, and cloud credentials, installed persistent backdoors, and operated a publicly exposed command and control infrastructure. The campaign involves exploitation, data exfiltration, and backdoor installation. Organizations running Next.js in production are advised to patch vulnerable systems immediately and rotate all potentially compromised credentials. The threat is assessed as medium severity with potentially widespread impact due to the scale and sensitivity of data targeted. European organizations using Next.js may be particularly at risk.