vBulletin - Authentication Bypass (CVE-2025-48827)
143Exploiting IPs reported
vBulletin 5.0.0 through 5.7.5 and 6.0.0 through 6.0.3 allows unauthenticated users to invoke protected API controllers' methods when running on PHP 8.1 or later, as demonstrated by the /api.php?method=protectedMethod pattern, as exploited in the wild in May 2025.
CrowdSec analysis
CVE-2025-48827 is a serious vulnerability in vBulletin versions 5.0.0 through 5.7.5 and 6.0.0 through 6.0.3 running on PHP 8.1 or later, allowing unauthenticated attackers to invoke protected API controller methods. This flaw can be exploited remotely, potentially leading to unauthorized access or manipulation of sensitive forum functions, as observed in active attacks in May 2025.
CrowdSec has been tracking this vulnerability and its exploits since 16th of July 2025.
Insights from the CrowdSec network reveal that the attackers trying to exploit CVE-2025-48827 are composed of a fairly even mix of opportunistic and targeted actors. Some attackers employ preliminary reconnaissance, while others use indiscriminate scanning. CrowdSec data also reveals a clear uptick in attacks involving CVE-2025-48827 over the past week. Activity is above the usual baseline, suggesting growing attention from attackers. This may reflect rising awareness, recent exploit releases, or expanded targeting efforts.
Attackers exploit this vulnerability by sending POST requests to the /ajax/api/ad/wrapAdTemplate endpoint, bypassing authentication to invoke protected methods and potentially execute arbitrary system commands.
Exploitation
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Protection
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Blocklist
With our advanced worldwide network detection, CrowdSec can provide a list of IPs known for exploiting the vulnerability.
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