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CVE-2023-23397

Microsoft Outlook Elevation of Privilege Vulnerability

CVSS 9.8 (CRITICAL) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.8/10
REALITY · THREAT PRIORITY
9.0/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 9.8: +1.47
  • Fresh EPSS: 97.16%: +0.49

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 23 documents and public datasets.

Hype components

Headline sample (25%)
20/100
Press, 30 days (60%)
5/100
Grounded branding (15%)
0/100
HYPE TOTAL8/100

Sources and documents

Rapid7 Cybersecurity Blog
Press · 13 Oct 2026, 21:40 · Patch Tuesday - October 2026
SentinelOne
Press · 14 May 2024, 07:00 · CVE-2023-23397: Microsoft Outlook Vulnerability - SentinelOne
EclecticIQ Blog
Press · 22 Dec 2023, 08:00 · Star Blizzard Operations Linked to Russian Intelligence Agency; APT28 Targets NATO’s Rapid Response - EclecticIQ Blog
TechTarget
Press · 18 Dec 2023, 08:00 · Akamai discloses zero-click exploit for Microsoft Outlook - TechTarget
The Hacker News
Press · 18 Dec 2023, 08:00 · Beware: Experts Reveal New Details on Zero-Click Outlook RCE Exploits - The Hacker News
See all 23 source documents
Computer Weekly
Press · 08 Dec 2023, 08:00 · Fancy Bear targets Nato entities via critical Outlook flaw - Computer Weekly
Unit 42
Press · 07 Dec 2023, 08:00 · Fighting Ursa Aka APT28: Illuminating a Covert Campaign - Unit 42
Cyber Security Hub
Press · 06 Dec 2023, 08:00 · Fancy Bear group exploits Outlook and WinRAR flaws in mass credential collection campaigns - Cyber Security Hub
Help Net Security
Press · 05 Dec 2023, 08:00 · Russian hackers use old Outlook vulnerability to target Polish orgs (CVE-2023-23397) - Help Net Security
Wojsko-Polskie.pl
Press · 04 Dec 2023, 10:59 · Detecting malicious activity against Microsoft Exchange servers - Wojsko-Polskie.pl
TechTarget
Press · 04 Dec 2023, 08:00 · Fancy Bear hackers still exploiting Microsoft Exchange flaw - TechTarget
Securelist
Press · 19 Jul 2023, 07:00 · Comprehensive analysis of initial attack samples exploiting CVE-2023-23397 vulnerability - Securelist
SOC Prime
Press · 23 Jun 2023, 07:00 · Microsoft Outlook Vulnerability CVE-2023-23397 Detection - SOC Prime
SECURITY.COM
Press · 11 Apr 2023, 07:00 · Protecting Against Outlook Elevation of Privilege Escalation - SECURITY.COM
Unit 42
Press · 31 Mar 2023, 07:00 · Threat Brief - CVE-2023-23397 - Microsoft Outlook Privilege Escalation - Unit 42
Microsoft
Press · 24 Mar 2023, 07:00 · Guidance for investigating attacks using CVE-2023-23397 - Microsoft
www.trendmicro.com
Press · 21 Mar 2023, 07:00 · Patch CVE-2023-23397 Immediately: What You Need To Know and Do - www.trendmicro.com
Group-IB
Press · 17 Mar 2023, 14:36 · Bleak outlook: Mitigating CVE-2023-23397 - Group-IB
Huntress
Press · 17 Mar 2023, 07:00 · Everything We Know About CVE-2023-23397 - Huntress
Cisco Talos Blog
Press · 15 Mar 2023, 07:00 · Threat Advisory: Microsoft Outlook privilege escalation vulnerability being exploited in the wild - Cisco Talos Blog
CrowdStrike
Press · 14 Mar 2023, 07:00 · March 2023 Patch Tuesday: Updates and Analysis - CrowdStrike
BleepingComputer
Press · 14 Mar 2023, 07:00 · Microsoft fixes Outlook zero-day used by Russian hackers since April 2022 - BleepingComputer
TechTarget
Press · 14 Mar 2023, 07:00 · Microsoft stops two zero-days for March Patch Tuesday - TechTarget

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.8 · reality 9.0 (2026-11-02 15:13). The curve appears once the score changes.

Public exploit evidence

10

Public exploit entries / repo candidates

See 10 repos with metrics
RepositoryStarsForksLanguageUpdated
api0cradle/CVE-2023-23397-POC-Powershell34457PowerShell17 Mar 2023, 07:47
Trackflaw/CVE-2023-2339713228Python24 Mar 2023, 10:46
ka7ana/CVE-2023-233974012PowerShell16 Mar 2023, 19:29
djackreuter/CVE-2023-23397-PoC92C#18 Mar 2023, 21:24
vlad-a-man/CVE-2023-2339782Python07 May 2023, 18:47
ahmedkhlief/CVE-2023-23397-POC67C#17 Mar 2023, 12:58
P4x1s/CVE-2023-23397-POC30Python31 Mar 2023, 03:37
ahmedkhlief/CVE-2023-23397-POC-Using-Interop-Outlook20C#19 Mar 2023, 08:10
moneertv/CVE-2023-2339710C#18 Mar 2023, 21:49
Phaedrik/CVE-2023-23397-POC10Python09 Jan 2026, 04:30
Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 9.8; EPSS 97.2%
Attention, last 30 days
1 distinct story titles; 1 press documents; 1 publisher domains.
Technical potential
network access, no prior privileges, no user interaction.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:58:50.790548+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Added to the CISA KEV catalog
14 Mar 2023, 00:00
First press mention
14 Mar 2023, 07:00
Published
14 Mar 2023, 16:55
Latest press mention
13 Oct 2026, 21:40
Score calculated
05 Nov 2026, 13:58
PoCs on GitHub
10 repositories
Source: CVE List V5 · CISA KEV · FIRST EPSS · GitHub · RSSVulnRadar