CVE-2026-48611
Confirmed PUBLISHEDImproper authentication checks in the OAuth implementation allow account hijacking even when OAuth is not configured or enabled leading to...
Not yet in CISA KEV
Recommended Action
Prioritize immediate patching and validate internet-facing exposure. Monitor for matching exploitation attempts in your environment.
At a Glance
Improper authentication checks in the OAuth implementation allow account hijacking even when OAuth is not configured or enabled leading to unauthorized access in default installations.
- CVE Published
- Jun 12, 2026
- Exploitation Reported
- Jul 19, 2026
- CVSS
- 9.8 Critical
- EPSS
- 2.9%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| phpBB |
phpBB
|
3.3.0 to <= 3.3.16 |
Affected |
CVE References
- phpbb.com/community/viewtopic.php phpbb.com · CVE Record https://www.phpbb.com/community/viewtopic.php?t=2672170
Recommended Actions
- Prioritize immediate patching and validate internet-facing exposure. Monitor for matching exploitation attempts in your environment.
- Review sensor telemetry for request paths, attacker IPs, and payload patterns that may inform detection and exposure validation.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| KEVIntel First | 2026-07-20 07:57 UTC |
Operational indicators for this CVE are listed on the Detection tab.
Observed Exploitation Attempts
Exploitation attempts against this vulnerability observed first-hand by KEVIntel private honeypots over the last 30 days.
- Attempts Observed
- 1
- Unique Attacker IPs
- 1
- Attacker Countries
- 🇳🇱
- Sensors Observed
- 1
Exploitation Attempts Over the Last 7 Days
First observed (all time) 2026-07-19 02:12 UTC · Last observed 2026-07-19 02:12 UTC
See more exploitation detail
- Pro — sensor software/region breakdown and 24h/7d window summaries.
- Enterprise — raw attacker IPs, request paths, User-Agents, and payloads.
Indicators of Compromise (IoCs)
Attacker IP IoCs observed in KEVIntel sensors are available to Pro and Enterprise accounts on the Detection tab and through the Pro API.
Learn about Pro API accessObserved Detection Signals (30d)
Aggregate counts from KEVIntel sensor telemetry for this CVE.
- Distinct request paths
- 1
- Distinct User-Agents
- 1
The specific request paths and User-Agents attackers are using are available on Pro and Enterprise plans.
Scanner Artifacts
Nuclei and Metasploit references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-48611.yaml | Jul 06, 2026 |
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitation Status
Exploited in the wild
Recorded 2026-07-19 02:12:35 UTC · KEVIntel
Active exploitation observed
Recorded 2026-07-19 02:12:35 UTC · KEVIntel sensor
Proof of concept available
Recorded 2026-06-13 10:21:15 UTC · GitHub
Weaknesses (CWE)
-
Improper Authentication
Scanner Integrations
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-48611.yaml | Jul 06, 2026 |
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2026-07-07 14:45:09 UTC · 0 stars
Bypass Authentication
github · Created 2026-06-19 10:28:58 UTC · 0 stars
CVE-2026-48611- authentication bypass in phpBB
github · Created 2026-06-13 10:21:15 UTC · 0 stars
(phpBB authentication bypass)
nuclei · Created Unknown
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
02:12 UTC 2 days ago02:12 UTC · 2 days ago
Observed by KEVIntel sensors
Evidence-backed exploitation signal
-
02:12 UTC 2 days ago02:12 UTC · 2 days ago
Indicator of compromise added
Indicators of compromise recorded
-
04:31 UTC 15 days ago04:31 UTC · 15 days ago
Nuclei template available
Scanner coverage available
-
10:21 UTC about 1 month ago10:21 UTC · about 1 month ago
Public PoC available
Public proof-of-concept code published
-
02:27 UTC about 1 month ago02:27 UTC · about 1 month ago
CVE published
Vulnerability disclosed publicly
-
15:00 UTC about 2 months ago15:00 UTC · about 2 months ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2026-48611
{
"cve_id": "CVE-2026-48611",
"title": "Improper authentication checks in the OAuth implementation allow account hija...",
"affected_vendor": "phpBB",
"affected_product": "phpBB",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 9.8,
"epss_score": 0.02865,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": true
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}