CVE-2026-97788: microsoft microsoft .net framework 3.5 Observable Discrepancy
CVSS: 7.5v3.1HighAnalyzed
Published 13-10-2026Last modified 19-10-2026
Vulnerability summary
CVE-2026-97788 is a high (CVSS 7.5) Observable Discrepancy vulnerability in microsoft microsoft .net framework 3.5. EPSS estimates a 0.68% chance of exploitation in the next 30 days, higher than 51.4% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (CVE.org)EPSS score
0.68%
0%100%
Low · Change unavailableKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 13-10-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
Description
Observable discrepancy in Active Directory Federation Services (AD FS) allows an unauthorized attacker to disclose information over a network.
CVSS metrics
2 scores · 2 sources · 1 versionHigh 7.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:CSourcesAll 2 agree
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS trend
Probability
0.68%
Chance of exploitation in the next 30 days
Percentile
51%
Versus all other CVEs
30-day change
Change unavailable
Change unavailable
14-10-202619-10-2026
EPSS score0.68%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Microsoft38 products
- microsoft .net framework 3.5≥ 3.5.0, < 2.0.50727.9188 AND 3.0.30729.9171
- microsoft .net framework 3.5 and 4.6.2/4.7/4.7.1/4.7.2≥ 3.0.0.0, < 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0
- microsoft .net framework 3.5 and 4.7.2≥ 4.7.0, < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0
- microsoft .net framework 3.5 and 4.8≥ 4.8.0, < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0
- microsoft .net framework 3.5 and 4.8.1≥ 4.8.1, < 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
1 vendor · 38 products
