HOMEVULNERABILITIESCVE-2026-28755
MEDIUM

CVE-2026-28755

CWE-863Published: March 24, 2026· Updated: Mar 26, 2026

5.4
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:0.9th

Official Description

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_stream_ssl_module module due to the improper handling of revoked certificates when configured with the ssl_verify_client on and ssl_ocsp on directives, allowing the TLS handshake to succeed even after an OCSP check identifies the certificate as revoked.  

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

NVD Source

Technical Analysis

CVE-2026-28755 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected Vendors & Products

f52 products
nginx plusnginx open source
Source: NVD CPE · 5 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

ADVISORYhttps://my.f5.com/manage/s/article/K000160368

All References (1)

→
https://my.f5.com/manage/s/article/K000160368Vendor Advisory · Mitigation

Quick Facts

CVE IDCVE-2026-28755
CVSS Score5.4 / 10
SeverityMEDIUM
WeaknessCWE-863
CISA KEVNo
EPSS (30d)0.01%
Affected1 vendor
PublishedMar 24, 2026

Related CVEs (CWE-863)

CVE-2026-48286
10.0
CVE-2026-48303
10.0
CVE-2026-44330
10.0
CVE-2026-27112
9.9
CVE-2026-41050
9.9
CVE-2026-41283
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-28755 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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