Adjacent information disclosure via improperly validated modem input
Published Jul 1, 2026 · Updated Jul 1, 2026
Authentication bypass in affected MediaTek chipset modems allows attackers controlling a rogue base station to disclose information. The modem accepts improperly validated input through an alternate authentication path; MediaTek has not disclosed the affected parser, message type, or exposed data. No privileges or user action are needed, but the UE must connect to the attacker-controlled base station, and the reported impact is information exposure only.
Summary
What happened
Authentication bypass in affected MediaTek chipset modems allows attackers controlling a rogue base station to disclose information. The modem accepts improperly validated input through an alternate authentication path; MediaTek has not disclosed the affected parser, message type, or exposed data. No privileges or user action are needed, but the UE must connect to the attacker-controlled base station, and the reported impact is information exposure only.
The record
- CVE
- CVE-2026-20460
- Published
- Jul 1, 2026
- Updated
- Jul 1, 2026
- Vendor
- MediaTek
- Product
- MediaTek Chipset
- Classifications
- CWE-288, T1557
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 1, 2026CVE publishedPublication date reported by the CVE source.
- Jul 1, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=MT2735
- Affected versionversion=MT2737
- Affected versionversion=MT6779
- Affected versionversion=MT6781
- Affected versionversion=MT6783
- Affected versionversion=MT6785
- Affected versionversion=MT6789
- Affected versionversion=MT6813
- Affected versionversion=MT6833
- Affected versionversion=MT6835
- Affected versionversion=MT6853
- Affected versionversion=MT6855
- Affected versionversion=MT6858
- Affected versionversion=MT6873
- Affected versionversion=MT6875
- Affected versionversion=MT6877
- Affected versionversion=MT6878
- Affected versionversion=MT6879
- Affected versionversion=MT6880
- Affected versionversion=MT6883
- Affected versionversion=MT6885
- Affected versionversion=MT6886
- Affected versionversion=MT6889
- Affected versionversion=MT6890
- Affected versionversion=MT6891
- Affected versionversion=MT6893
- Affected versionversion=MT6895
- Affected versionversion=MT6896
- Affected versionversion=MT6897
- Affected versionversion=MT6899
- Affected versionversion=MT6980
- Affected versionversion=MT6983
- Affected versionversion=MT6985
- Affected versionversion=MT6986D
- Affected versionversion=MT6988
- Affected versionversion=MT6989
- Affected versionversion=MT6990
- Affected versionversion=MT6991
- Affected versionversion=MT6993
- Affected versionversion=MT8673
- Affected versionversion=MT8675
- Affected versionversion=MT8676
- Affected versionversion=MT8678
- Affected versionversion=MT8755
- Affected versionversion=MT8765
- Affected versionversion=MT8766
- Affected versionversion=MT8766R
- Affected versionversion=MT8768
- Affected versionversion=MT8771
- Affected versionversion=MT8775
- Affected versionversion=MT8781
- Affected versionversion=MT8786
- Affected versionversion=MT8788
- Affected versionversion=MT8788E
- Affected versionversion=MT8789
- Affected versionversion=MT8791
- Affected versionversion=MT8791T
- Affected versionversion=MT8792
- Affected versionversion=MT8793
- Affected versionversion=MT8795T
- Affected versionversion=MT8796
- Affected versionversion=MT8797
- Affected versionversion=MT8798
- Affected versionversion=MT8863
- Affected versionversion=MT8873
- Affected versionversion=MT8883
- Affected versionversion=MT8893
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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