CVE-2026-62911: Microsoft Exchange Server Elevation of Privilege Vulnerability
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-08 00:03 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Description quoted from the CVE record (assigned by microsoft, published 2026-08-11).
Weakness: CWE-294: Authentication Bypass by Capture-replay
How it can be exploited
Exploitable over the network with low attack complexity needing low privileges and a user must take an action. Impact: confidentiality high, integrity high, availability high. CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CISA assessment (SSVC): CISA assesses that a public proof of concept exists. Automatable: no. Technical impact: total.
Public exploit evidence (Exploit Observer)
Exploit Observer found 6 code repositories and 4 research write-ups naming this CVE.
Code repositories that name a CVE are often scanners, copies or fakes, and some are malware. Read the code before running anything.
See all 16 references on Exploit Observer
Live scores
- EPSS
- 0.007
low predicted chance of attack - VEDAS
- 0.989
strong exploit evidence - On CISA KEV
- Not listed
- Detection rule
- No public rule yet
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| Microsoft Exchange Server 2016 Cumulative Update 23 | from 15.01.0.0 before 15.01.2507.072 | Not stated |
| Microsoft Exchange Server 2019 Cumulative Update 14 | from 15.02.0.0 before 15.02.1544.044 | Not stated |
| Microsoft Exchange Server 2019 Cumulative Update 15 | from 15.02.0.0 before 15.02.1748.049 | Not stated |
| Microsoft Exchange Server Subscription Edition RTM | from 15.02.0.0 before 15.02.2562.046 | Not stated |
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
How to fix it
Fixed versions stated in the CVE record: 15.01.2507.072, 15.02.1544.044, 15.02.1748.049, 15.02.2562.046.
Vendor guidance:
- Microsoft Exchange Server Elevation of Privilege Vulnerability (vendor-advisory, patch)
How to detect it
There is no open VEDAS detection rule for this bug yet. It is listed on the detection gaps page if CISA has confirmed attacks.
References
Vendor advisories and patches
- Microsoft Exchange Server Elevation of Privilege Vulnerability (vendor-advisory, patch)
Exploit code
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.
Supporting partners
