CVE-2021-26854

Description

References

• msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26854
• portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26854 · Patch

More vulnerabilities in exchange server

• CVE-2026-87696HIGH 7.5Improper verification of cryptographic signature in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a net…
• CVE-2026-87695HIGH 7.8Inclusion of functionality from untrusted control sphere in Microsoft Exchange Server allows an authorized attacker to elevate privileges lo…
• CVE-2026-87692HIGH 7.8Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.
• CVE-2026-96940HIGH 8.8Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
• CVE-2026-69641CRITICAL 9.1Missing authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.