CVE-2026-455048.8HighCWE-918
CVE-2026-45504: Microsoft Exchange Server 2016 Cumulative Update 23 vulnerability
Microsoft · Microsoft Exchange Server 2016 Cumulative Update 23
Vendor fix available · Affected: Microsoft Exchange Server 2016 Cumulative Update 23 · Exploitation: public proof of concept (unverified)
ExploitationProof of concept public
Not in CISA KEV as of catalogue 2026.11.13 (13 Nov)
- In CISA KEV: not seen
- Exploited (reported): not seen
- Scanning observed: not seen
- Proof of concept public1 public GitHub repository (unverified), listed by PoC-in-GitHub24 Jun
- Not established: not seen
1.3%probability of exploitation in the next 30 days
71st percentile
050100
Higher than 71% of scored CVEs
8.8HighCVSS 3.1
LowMediumHighCrit.
DescriptionNVD
Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Possible (1 to 10%). EPSS between 1% and 10%.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Weakness
- Server-Side Request Forgery
- Vendor
- Microsoft
- Published
- June 2026
What changed
- PoC-in-GitHub lists 1 public GitHub repository (unverified) PoC-in-GitHub
Coverage1 article · 1 outlet
First in our coverage: SecurityOnline, 3 Jul.
- CVE-2026-45504: Exchange flaw lets low-priv users read filesSecurityOnline · first in our coverage
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